\documentclass[letterpaper,12pt]{article}

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\usepackage{hyperref}
\usepackage{graphicx}
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\usepackage{color}
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\usepackage{listings}
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\usepackage{mdwlist}

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%\setlength{\bibspacing}{2\baselineskip}

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\newcolumntype{x}[1]{%
>{\centering\arraybackslash}p{#1}}%
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\newcommand{\tn}{\tabularnewline}

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\begin{document}
\date{}
\title{Parallelizing Particle Simulation for a GPU}
\author{
{\rm Sara Alspaugh and Joe Gomes}\\
University of California, Berkeley\\
% copy the following lines to add more authors
% \and
% {\rm Name}\\
%Name Institution
} % end author

\maketitle

% \thispagestyle{empty}
%\input{abstract}

%!TEX encoding = UTF-8 Unicode

\input{intro}
\input{serial}
\input{parallel}
\input{discussion}
\input{conclusion}
\input{appendix}

% We could also perhaps push this down to \scriptsize
%{\scriptsize
\bibliographystyle{plain}
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\bibliography{writeup}
%}
\end{document}
